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Hence, selfish genes will lead to altruistic animals
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because, to the extent that evolution operates
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at the level of the genes,
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there's no hard and fast distinction
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between your own body and someone else's body.
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And here's an illustration by the biologist Haldane.
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So, Haldane was once asked,
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"Would you lay down your life for your brother?"
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And he responded,
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"No, but I would gladly give my life for three brothers
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or five nephews or nine first cousins."
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Now, he's joking.